Bug 12176: Fix for missing field_value in select

Bug 12176: Fix for missing field_value in select

As Jonathan Druart discovered, we were still missing an important attribute
in the selects. Var mv.name was not filled, so the name was empty with nice
side-effects :)
While fixing this, it was also possible to delete some unused vars that Bernardo
already mentioned before: $attributes and $attributes_no_value.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
For me the simptom was different, when saving an edited item
fields were mangled beyond repear :(
No alert for empty mandatory fields.

But this last patch fix the problem.
Tested add/edit items
Cleaner pl file :)
No errors

Signed-off-by: Jonathan Druart <jonathan.druart@koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>